You can drink water without having to take the bottle out of your backpack. Specifications: Material: Food grade TPU Silicone PE Blue Hose Length: 80 cm / 31.5 in Transparent Hose Length: 40 cm / 15.7 in Package Size: 18 * 14 * 4 cm / 7.1 * 5.5 * 1.6 in Package Weight: approx. 128 g / 4.5 oz Package List: 1* Water Bottle Hose